First find the source of water, which is most likely a leak. We had this problem. One clue might be wet molding. The other clue is that the LVP seems to have water under it and you can feel that it presses down to the concrete when you walk on it. If it is not a drain issue, the floor of the shower itself will be fine.
The cause of the problem was a leak in the plastic pipe to the shower. Somehow it had been nicked during the build. It eventually failed with a miniscule leak. Since the leak was between the valve and the head, it only leaked, and slowly, while the shower was running.
Lots of flooring needed to be replaced. Also a heater and fan was used for about 48 hours to dry out the drywall before closing it up and replacing the flooring.
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